I am using the BoardGame Widget for my website. Earlier I had selected an image for each game that highlights that game under "MyGeek" > "Collection". It gave me an image number when I recorded it... (ex: Image 14029)
Some better pictures are out there now and I would like to change my default images for at least some of my games... so that they reflect these "newer" pictures instead of the older images I had previously chose.
Look at the top of the game for your tags. You should see only one OWN:xxx tag. If you see more than one, then you have selected multiple images. This will give you a random one each time. To fix it on one image, unset the other tag.
Also, if you use the "I Don't Know, What Do You Want To Play?" Card generator, it only takes the first image tagged. (Best kept secret so far!)